in gun violence. since columbine, more than 30 mass murders. the latest is chilling. >> shame on nra. >> reporter: as protesters gathered outside of washington, the nra declined to comment on the debate. but there were signs that they have. joe manchin, a life long nra member said he's rethinking his position. >> i don't know anybody that goes hunting with an assault rifle. i don't know anybody that needs those types of multiple clips as far as ammunition. >> reporter: and joe scarborough, now an nbc host also reversed himself on gun control. >> politicians can no longer be allowed to defend the statistic customer quo, they must instead be forced to defend our children. >> reporter: at least one texas republican defends the rights of owners. amid the talk of gun control, gun sales have picked up. in portland, just a week after a gunman killed two in an area mall. >> yesterday was the biggest day we've ever done in 20 years. today will probably eclipse that. >> reporter: gun control off of washington in a decade, suddenly front and center. tom costello, nbc "nightly news," washington.